- acpi.rs: LPI_MWAIT_HINT/LPI_MWAIT_HINT_SET atomics + set/get
accessors; AcpiVerb::SetLpiHint handler reads the 4-byte LE
payload and stores the firmware-recommended MWAIT hint.
- interrupt/mod.rs idle_loop(): prefer the LPIT entry_trigger hint
(set by acpid) for mwait_loop(); fall back to CPUID leaf-5 max
substate when no LPIT hint is available (no LPIT table, or
pre-acpid boot).
This is the full Modern Standby integration: the CPU now enters the
firmware-optimal deepest LPI state during s2idle, not merely the
CPUID-reported deepest state.
vasilito
00da984779